Based on my observations this ARBOR for hole saws was a complete waste of money. Despite being labeled as an industrial and scientific standard, the construction and durability were subpar. While the arbor could fit multiple saw sizes, it often struggled to hold them in place during use. The one positive aspect was the price point, but it's not worth sacrificing quality for affordability. Overall, i would not recommend this product for anyone looking for a reliable and long-lasting arbor.Cons: poor construction and lack of durability. pro: affordable price..